One witness, who works in a nearby shop, said he heard three distinct bangs, which sounded like “fireworks”.

He said he saw the victim with blood on her chest sitting with friends following the shooting, before police cars and ambulances arrived.

Close to the scene, residents held an impromptu celebration of Tanesha’s life until the early morning.

“We were out here until one o’clock in the morning,” a neighbour said.

“It was really heart-breaking. We were here for ages but clearly she was already gone.”

Formal identification has yet to take place. However, Tanesha’s next-of-kin have been informed of her death.

The Walthamstow crime scene, in Markhouse Road, is just over two miles (3.5km) from the site of the Tottenham killing.

Stella Creasy, Labour MP for Walthamstow, said the 16-year-old boy – who was taken to a hospital in east London – was still in “intensive care”.

Scotland Yard said the 15-year-old boy who was stabbed in Walthamstow has life-changing but not life-threatening injuries.

There have been no arrests in either investigation.

It brings the total of fatal shootings in London this year to six, including one man who died after being shot and stabbed.

A Downing Street spokesman said: “There can be no place in our society for violent crime. The Government is determined to do everything it can to break the cycle.

“We have already consulted on new laws on offensive and dangerous weapons, including banning online stores from delivering knives to residential addresses and making it an offence to possess certain weapons in private.”